Air-heater for smelting-furnaces.



No. 718,755. PATENI'BD JAN. 20, 1903. J. L. GIROUX. AIR HEATER FOR SMELTING FURNACES.

APPLICATION FILED MAY 26, 1902. NO MODEL.

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UNTTE STATns PATENT FFICE.

JOSEPH L. GIROUX, OF JEROME, ARIZONA TERRITORY.

AlR-HEATE FOR SMELTING FURNACES.

SPECIFICATION forming part of Letters Patent No. 718,755, dated January 20, 1903.

- Application filed May 26,1902.

To all whom, it may concern:

Be it known that I, JOSEPH L. GIRoUX, a citizen of the United States, residing at Jerome,county of Yavapai,Territory of Arizona, have invented an. Improvement in Air-Heaters for Smelting-Furnaces; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to a device for heating air which is especially designed for use in connection with smelting and like furnaoes.

It consists of a series of vertically-disposed pipes arranged to inclose the upper portion of the furnace through which the hot products of combustion pass, and from which pipes the air is led to the twyers, through which it is delivered into the lower part of the furnace proper. In conjunction with these vertical pipes I have shown a series of pipes extending transversely across the furnace above the vertical pipes, into which transverse pipes the air is first transmitted and delivered from these pipes to pass through the vertical pipes and thence through the bustle-pipe or trunk, from which it is passed to the twyers.

My invention also comprises details of construction, which will be more fully explained by reference to the accompanying drawings, in which Figure 1 is a vertical elevation and partial section. Fig. 2 is a side elevation, and Fig. 3 is an enlarged horizontal section taken through a: as of Fig. 1. Figs. 4 and 5 are different formsof the vertical pipes.

A is the shell of a furnace. In the present case I have represented a smelting-furnace of the ordinary construction, having a discharge-stack, as at B. The furnace proper is located in the lower portion and is not here especially shown or described, as not being a part of my present invention. The space within the furnace-shell and above this lower portion of the furnace is utilized to heat the air, which is afterward introduced through twyers, as at 2, into the smelting portion of the furnace.

Various arrangements of pipes may be employed. As here shown, the cold air is admitted through the pipe, as at and passes thence into the pipes 4, which extend trans- Serial No. 108,982. on, model.)

versely across from side to side, being connected by suitable bends or elbows exterior to the furnace, as at 5, and the air is thus constantly returned backward and forward through the pipes 4 and is finally delivered from the lowermost section 5 into the first of the vertical pipes, which are indicated at 6. These pipes are similarly connected aiternately at bottom and top, so that the air passing into the upper end of the first pipe will be delivered from its lower end into the bottom of the second pipe, thence passing'up through this pipe, delivered into the upper end of the third pipe, and so on entirely around the furnace, as shown in Fig. 3, or it may be subdivided if it is found that it is sufficiently heated in this manner. From this point the air is delivered through the pipe, as shown at 7, into the trunk or bustlepipe 8, which surrounds the exterior of the furnace, and from this pipe or trunk the pipes 2 connect with the twyers opening into the lower smeltingportion of the furnace. The vertical pipes 6 may either be made essentially straight, as shown in Fig. 4, or they may be made divergent from one end to the other, as shown in Fig. 5, the object of this divergence being to give greater space and slower movement to the air if. found desirable.

Having thus described my invention, what I claim, and desire to secure by Letters Patcut, is

1. In a furnace, the combination of a series of vertically-disposed pipes surrounding the upper portion of the furnace; a second series of horizontal pipes forming a tortuous airpassage, said second series of pipes located in the upper portion of the furnace above the first-named series, extending through the sides of the fu mace-casing and having elbows exterior to the casing, said second series of pipes connected with the first series; means for admitting air to one series of pipes; and means for delivering air from the other series of pipes to the furnace.

2. The combination in a furnace of air-heating means in the upper portion thereof; aseries of vertically-disposed pipes surrounding the upper part of the furnace substantially forming a lining therefor; said vertical pipes divergent from one end to the othergconnec tion with said heating means and forming a tortuous air-passage; means for admitting air to the air-heating means; and means for delivering the heated air from the vertical series of pipes into the furnace.

3. The combination with a smelting-furnace of a horizontal heating-coil in the upper portion of the furnace, a series of verticallydisposed pipes surrounding the interior of the upper partof the furnace, and connected with the terminal of the heating-coil, and the pipes of the series made divergent from one end to the other, and having alternate ends connected to form a tortuous passage, an inlet by which air is admitted under pressure at one end, an outlet from the opposite end, and connection between said outlet and a surrounding trunk or bustle-pipe, and pipes leading from said trunk to the twyers of the furnace.

4. The combination with a smelting-furnace of a series of vertically-disposed pipes surrounding the interior of the upper portion of the furnace, a series of substantially horizontal transverselydisposed pipes located above the vertical pipes, having their ends projecting through opposite sides of the furnace-casing and provided with exterior connecting-elbows by which adjacent ends of the pipe are united to form tortuous passages, connection between the horizontal and the vertical pipes and an inlet-passage through which air is admitted under pressure.

5. The combination with a smelting-furnace of a series of substantially horizontal pipes extending transversely through the upper portion and at the base of the stack, said pipes having elbow connections exterior to the furnace, an inlet-pipe whereby air is admitted under pressure, and a discharge-pipe through which the air is conducted to intermediate connections and to the twyers of the furnace.

In witness whereof I have hereunto set my hand.

JOSEPH L. GIROUX.

Witnesses:

J. G. BARTON, THOS. K. ELREY. 

